Useful advice, thanks.
Have discovered I have up to date premiere elements.
Canon utilities were not up to date so now running latest. I haven't used it before bit discover now that it works to take photos from the computer terminal remotely.
Understand now that if you select webcam in premiere elements that you get the option to capture stop motion.
However the computer's inbuilt webcam is the only one showing up in the capturing source box. Are you expecting that extrawebcam.com will install a driver such that the Eos 40d will appear on this list? I am reluctant to download (especially free) software unless I know what it does as I have been burnt in the past getting annoying extra programs I didn't expect!
Thanks